diff --git a/static/themes/default/css/main.css b/static/themes/default/css/main.css
index c28e323d0..c9b877e02 100644
--- a/static/themes/default/css/main.css
+++ b/static/themes/default/css/main.css
@@ -6,7 +6,6 @@
     --neutral-light-color: #f5f5f5; /* Light grey */
     --freedombox-blue-color: #4989D4; /* Blue */
     --progress-color: #3498db; /* Blue */
-    --freedombox-form-disabled-bg-color: #e9ecef; /* Grey */
     --freedombox-navbar-color: white;
 
     /* Missing variables in Bootstrap 5.2 copied from Bootstrap 5.3 */
@@ -99,7 +98,7 @@ form .alert .close {
 
 /* Disabled form elements show as gray, removed in Bootstrap 5 */
 .form-control:disabled, .form-control[readonly] {
-    background-color: var(--freedombox-form-disabled-bg-color);
+    background-color: var(--bs-secondary-bg);
     opacity: 1;
 }